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use CHT abstraction in provider

This commit is contained in:
Robert Habermeier 2017-02-03 18:47:03 +01:00
parent fc8e9e39ec
commit 1baa824d1e
1 changed files with 38 additions and 30 deletions
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68
ethcore/light/src/provider.rs
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@ -23,6 +23,8 @@ use ethcore::transaction::PendingTransaction;
use ethcore::ids::BlockId;
use ethcore::encoded;
use cht::{self, BlockInfo};
use util::{Bytes, H256};
use request;
@ -227,48 +229,54 @@ impl<T: ProvingBlockChainClient + ?Sized> Provider for T {
}
fn header_proof(&self, req: request::HeaderProof) -> Option<(encoded::Header, Vec<Bytes>)> {
use util::MemoryDB;
use util::trie::{Trie, TrieMut, TrieDB, TrieDBMut, Recorder};
if Some(req.cht_number) != ::cht::block_to_cht_number(req.block_number) {
if Some(req.cht_number) != cht::block_to_cht_number(req.block_number) {
debug!(target: "les_provider", "Requested CHT number mismatch with block number.");
return None;
}
let mut memdb = MemoryDB::new();
let mut root = H256::default();
let mut needed_hdr = None;
{
let mut t = TrieDBMut::new(&mut memdb, &mut root);
let start_num = ::cht::start_number(req.cht_number);
for i in (0..::cht::SIZE).map(|x| x + start_num) {
match self.block_header(BlockId::Number(i)) {
None => return None,
Some(hdr) => {
t.insert(
&*::rlp::encode(&i),
&*::rlp::encode(&hdr.hash()),
).expect("fresh in-memory database is infallible; qed");
if i == req.block_number { needed_hdr = Some(hdr) }
// build the CHT, caching the requested header as we pass through it.
let cht = {
let block_info = |id| {
let hdr = self.block_header(id);
let td = self.block_total_difficulty(id);
match (hdr, td) {
(Some(hdr), Some(td)) => {
let info = BlockInfo {
hash: hdr.hash(),
parent_hash: hdr.parent_hash(),
total_difficulty: td,
};
if hdr.number() == req.block_number {
needed_hdr = Some(hdr);
}
Some(info)
}
_ => None,
}
};
match cht::build(req.cht_number, block_info) {
Some(cht) => cht,
None => return None, // incomplete CHT.
}
}
};
let needed_hdr = needed_hdr.expect("`needed_hdr` always set in loop, number checked before; qed");
let mut recorder = Recorder::with_depth(req.from_level);
let t = TrieDB::new(&memdb, &root)
.expect("Same DB and root as just produced by TrieDBMut; qed");
if let Err(e) = t.get_with(&*::rlp::encode(&req.block_number), &mut recorder) {
debug!(target: "les_provider", "Error looking up number in freshly-created CHT: {}", e);
return None;
// prove our result.
match cht.prove(req.block_number, req.from_level) {
Ok(Some(proof)) => Some((needed_hdr, proof)),
Ok(None) => None,
Err(e) => {
debug!(target: "les_provider", "Error looking up number in freshly-created CHT: {}", e);
None
}
}
// TODO: cache calculated CHT if possible.
let proof = recorder.drain().into_iter().map(|x| x.data).collect();
Some((needed_hdr, proof))
}
fn ready_transactions(&self) -> Vec<PendingTransaction> {